Chain pipe-wrench.



G. AMBURN.,

` GHAIN PIPE WRENCH. APLIOATIOH FILED 00T.25,1910.

PatentedMar. 7, 1911'.

WITNESS-ES:

GEORGE .AMBORN, 0F NEW YORK, N. Y., ASSIGNOR TO J. H. WILLIAMS c C0., OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

UNITED sTATEs PATENT oEErcE.

CHAIN PIPE-WRENCH.

Specification of Letters Patent.

Patented Mar. *7, 1911.

Application filed October25, 1910. Serial No. 588,950.

To all whom it may concern:

Be it known that I, GEORGE AMBoRN, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Chain, Pipe-Wrenches, of which the following is a specification.

This invention relates to chain pipe wrenches and aims to provide certain improvements therein.

In certain patents heretofore granted to me, of which No. 876,926 is an example, I have described and claimed a wrench having double-ended reversible jaws which are adapted to be turned end for end in order that the opposite ends of the jaws may be turned into working positions. In this ccnstruction the chain is not only pivoted centrally of the jaws so as to act in either direction, but is illustrated as pivoted at a point which is approximatelyT at the middle of the length of the jaws.

The present invention relates to a modification of this type of wrench by which it is especially adapted for use in connection with what is known as a cable chain as distinguished from the usual flat link chain. I have found in practice that if the pivot of the chain. is displaced rearwardly from the middle line of the jaws, it in effect lengthens the jaw which is in use and enables the wrench to obtain a better grip upon the work. This is particularly true in connection with a cable chain, although the invention may be used with a fiat link chain, if desired.

Referring to the drawings which illustrate one embodiment of the invention, Figure 1 is a side elevation of a wrench provided by my invention. Fig. 2 is a top or plan view thereof with chain removed. Fig. 3 is an elevation of the inner side of one of the aws.

Referring to the drawings let A designate the wrench as a whole which comprises essentially one or more jaws B B', fixed to the end of a handle C, and a chain D connected to the jaws or handle.

The jaws B B are double ended, that is to say, each is provided with working faces at its opposite ends. When the working faces at one end of the jaws become dulled or worn, the jaws are reversed to bring into position the reserve faces. The chain D is pivoted centrally of the wrench upon a bolt or pivot E, so that the chain is adapted to operate from the same point on either side of t-he wrench. In the construction shown each of the jaws is provided with locks F on its upper and lower sides, such locks being adapted to engage the chain when the jaws are in their normal or reversed positions. Other means for locking the chain may be adopted.

In my aforesaid patent, wherein this type of wrench is illustrated, the pivot pin E is shown as arranged not only centrally of the wrench, but midway between the ends of the jaws. A wrench as thus constructed is particularly effective and a practical wrench, especially when the chain employed is of the flat link type. I have found in practice, however, that its efficiency may be increased, particularly when the chain employed is of the cable type, by displacing the pivot pin E to a point somewhat to the rear of the middle line between the ends of the jaws. By this means the effective length of the jaws is increased while retaining their original dimensions.

In constructing the wrench according to the present invention instead of the jaws being provided with a single bolt hole through which the pivot pin or bolt E passes, this bolt hole is duplicated as shown at G- G', the holes being located equi-distantlj/v from each side of the middle point of the jaws. The slot H which is formed in the end of the handle to receive the pivot link I of the chain is increased in length in order to permit the rearward displacement of the pivot pin E and link I. The jaws are also provided with holes J J through one of which a fastening bolt K is passed extending through the handle as illustrated.

The handle and jaws are provided with interengaging faces in order to relieve the bolts K and E of the strains of use, such engaging faces preferably comprising in the construction shown ledges or projections L formed on the inner faces of the locks F, such ledges engaging the upper and lower faces of the handle. When the working faces of one end of the jaws become dulled or worn, the pivot pin E and bolt K will be removed, the jaws reversed and placed in positions wherein the holes G and J are in alinement with the corresponding holes in the handle, and the pin and bolt replaced.

By this operation the opposite ends of the jaws will be brought into positions wherein they have the same effective length as the end rst used.

While I have described in detail one form of the invention, I do not wish to be limited thereto as various modifications can be made therein without departing from the invention. It is also obvious that the invention may be applied to chain pipe vises, or the like.

What I claim is l. In a reversible chain pipe wrench or the like, the combination of a double-ended reversible jaw, a handle and a Chain, and means for pivoting said ohain, so that it may be moved to either side of the aw, said means being displaced rearwardly from the middle point of the jaw and permitting said chain to be used on either side of the wrench.

2. In a reversible chain pipe wrench or the like, the combination of a. double-ended reversible jaw, a handle and a cable chain, and means for pivoting said cable chain, so that it` may be moved to either side of the jaw, said means being displaced rearwardly from the middle point of the jaw and permitting said chain to be used on either side of the wrench.

3. In a reversible chain pipe wrench or the like, the combination of a do-uble-ended reversible jaw, a handle and a chain, and means for pivoting said chain centrally of the jaw, so that it may be moved to either side of the jaw, said means being displaced rearwardly from the middle point of the jaw and permitting said chain to be used on either side of the wrench.

4. In a reversible chain pipe wrench or the like, the combination of two jaws, a handle, a chain, and means for pivoting said chain centrally between said jaws, so-that it may be moved to either side of the jaw, said means being displaced rearwardly from the middle point-s of said jaws and permitting said chain to be used on either side of the wrench.

5. In a chain pipe wrench or the like, the combination of two double-ended reversible jaws, a handle, a chain, and means for pivoting said chain, said means being displaced rearwardly from the middle points of said jaws, and said jaws being provided with two holes through one of which said pivoting means extends in one position of the jaws and through the other of which it eX tends in the reverse position of the jaws.

6. In a chain-pipe wrench o-r the like, the Combination of a handle, two reversible double-ended jaws attached thereto, and a chain, said handle being slotted at its end, said chain being pivoted centrally in the slotted part of the handle, and at a point displaced rearwardly from the middle point of the jaws, and said slots extending in front of the pivotal point of the Chain, whereby the Chain can be moved to either side of the wrench.

In witness whereof7 I have hereunto signed my name in the presence of two subscribing witnesses.

GEORGE AMBORN.

Witnesses:

CHARLns E. AHRENSFIELD, HENRY L. FREEsn.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

